The whole Scarface/"If the cops bring the hammer it would be Custers last stand"/Photo on that external page (about the character THAT I REALLY WISH I DIDN'T SEE)/Machine gun out of town (on his own) in the flash-forward/Walt questioning Mike's extra deductions...all point to a Walt self aggrandising and self destructing...but it points to it too easily, like it's more telegraphed than any previous storyline.
I actually think Skylar will possibly not be able to deal with the pressure and spill all to Marie or Hank.
(Btw, does anyone else think that (the actress that plays) Skylar looks all a bit different (plastic surgery/botox different)? But I digress...)